Putting in extruder, any tips when ptfe won't fit!

Hey, so I test fitted the extruder and it was tight, but now I am trying to mount them properly the ptfe tube struggles to get in, I am sanding with a small file but wonder if there are any tips or easier ways to do this.... So far spent twenty mins on this and it's better but still not in all the way. And I have another to do after.

Attached Files:

So it wasn't the ptfe, it was the main hole bit that needed to be widened on the left. I now have both in and you will be pleased to hear they are at completely different heights... A job for tomorrow I think.
If anyone stumbles on this, do not take out the grub screws, the nuts will move and block the extruder in the hole so you can't remove it.